Define exothermic and endothermic reactions. Give two examples of each.

Open in App

Solution

Exothermic reactions: The chemical reaction in which heat is given out is called exothermic reactions.
It causes rise in temperature. .
e.g. (i) When carbon bums in oxygen to form carbon dioxide, a lot of heat is produced.
$C + O 2 \to C O 2$ + heat.
When water is added to quicklime a lot of heat is produced which boils the water.
$C a O + H_{2} O \to C a (O H)_{2} + H e a t$
Endothermic reaction: A chemical reaction in which heat is absorbed is called endothermic reaction. It
causes fall in temperature.
e.g. (i) When nitrogen and oxygen together are heated to a temperature of about 3000°C, nitric oxide
gas is formed. $N_{2} + O_{2} + h e a t \to 2 N O (g)$
(ii) Decomposition of calcium carbonate into carbon dioxide and calcium oxide when heated to a
1000°C.
$C a C O_{3} + h e a t \to C a O (s) + C O_{2} (g)$

Suggest Corrections

Similar questions

Define exothermic and endothermic changes. Give two examples in each case.

What are Exothermic and Endothermic reactions? Give one example of each of them.

What do you understand by exothermic reaction and endothermic reaction? Give one example of each type.

What does one mean by exothermic and endothermic reactions? Give examples.

Join BYJU'S Learning Program